Streetguard is a portable device that triggers the alarm of cars in a 25-meter range by a woman who is in grave danger.

It can be possible by a small enhancement made in all cars that have hired Alarm Systems de México. This doesn't affect the car computers, the regular alarm system nor the general functioning of the vehicles. Streetguard triggers the alarm, thus obtaining the attention of people in streets and the residents in adjacent homes, trying to avoid possible crimes.

Streetguard works with radio frequency technology, the same used in the car’s alarm. We wanted to guarantee the safety of all peers, so it's development do not interfere with the car’s computer or security systems since it could be used for malicious purposes. Instead, we focused on the basic principle used in the majority of the cars which is a closed circuit to monitor if a door is open or not. We connected a switch that can only be triggered when paired with a Streetguard transmitter device. If someone activates Streetguard, it will simulate the signal of an open door in nearby cars for a few seconds which triggers all car alarms. It is important to mention that the vehicles will never open, it just activates the lights and siren for the programmed time of the car, and after that, all the alarms will continue to work as designed.

Components for transmitter:

Button

RF circuit

Battery

3D printed case

Components for the receiver:

Microcontroller

RF circuit

Regulating circuit 12V to 5V

Case

We’ve developed an idea that not only saved lives but also changed the dynamics of a community. Streetguard is making crime cells move to other city areas. The idea still hasn't occasioned any arrest, but we have increased the police force in potential crime scenes. For a small cost, we could make people look at each other backs, and use the problem of streets crowded with cars to aware society of all the violence that women suffer on the streets.